early high comp engines

[slippo]

is there any way to tell apart the low/high comp engines? mines a 88 e reg chromp bumper cab so i think that right on the change over, is ther any numbers or ne thing?

[Ziggy]

Um... easiest way's probably to look at the ECU - if the number ends in 073 it's on early (1.1?) Motronic, 173 is late (1.3?). They swapped at the same time as the high / low comp lumps... I expect you can tell from engine numbers too, but I don't know how exactly!

[tomson]

checking the ecu numbers isnt conclusive.

Ive had open at least 2 motronic managed m20's that have the early high compression pistons in them and ive spoken to others that have found the same thing.

I would think the way to tell without removing the head would be to measure the compression perhaps???

HTH

[reggid]

engine code which is near to the engine number on the side of the block

25 6k 1 = low comp
25 6e 1 = high comp

[slippo]

cool cheers will have a look

[maggspower]

have a look at the plug that the reset tool goes into, its by the inlet manifold towards the front end of the car, the pre face lift one is small and D shaped face lift one is larged and round that way you can tell at a glance. hope this helps.

[maggspower]

what i ment was D shaped is high comp

[tomson]

what i ment was D shaped is high comp

as per my earlier post thats not always the case........